US6581922B2 - Sheet processing apparatus above image forming means and image forming apparatus - Google Patents

Sheet processing apparatus above image forming means and image forming apparatus Download PDF

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Publication number
US6581922B2
US6581922B2 US09/791,775 US79177501A US6581922B2 US 6581922 B2 US6581922 B2 US 6581922B2 US 79177501 A US79177501 A US 79177501A US 6581922 B2 US6581922 B2 US 6581922B2
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United States
Prior art keywords
sheet
stacking portion
image forming
processing apparatus
sheet processing
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Expired - Lifetime, expires
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US09/791,775
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English (en)
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US20010052666A1 (en
Inventor
Takashi Kuwata
Yasuyoshi Hayakawa
Kaoru Sato
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Canon Inc
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Canon Inc
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Assigned to CANON KABUSHIKI KAISHA reassignment CANON KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HAYAKAWA, YASUYOSHI, KUWATA, TAKASHI, SATO, KAORU
Publication of US20010052666A1 publication Critical patent/US20010052666A1/en
Priority to US10/420,732 priority Critical patent/US7216863B2/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H31/00—Pile receivers
    • B65H31/30—Arrangements for removing completed piles
    • B65H31/3009—Arrangements for removing completed piles by dropping, e.g. removing the pile support from under the pile
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J13/00—Devices or arrangements of selective printing mechanisms, e.g. ink-jet printers or thermal printers, specially adapted for supporting or handling copy material in short lengths, e.g. sheets
    • B41J13/26—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42C—BOOKBINDING
    • B42C1/00—Collating or gathering sheets combined with processes for permanently attaching together sheets or signatures or for interposing inserts
    • B42C1/12—Machines for both collating or gathering and permanently attaching together the sheets or signatures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H31/00—Pile receivers
    • B65H31/02—Pile receivers with stationary end support against which pile accumulates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H31/00—Pile receivers
    • B65H31/30—Arrangements for removing completed piles
    • B65H31/3009—Arrangements for removing completed piles by dropping, e.g. removing the pile support from under the pile
    • B65H31/3018—Arrangements for removing completed piles by dropping, e.g. removing the pile support from under the pile from opposite part-support elements, e.g. operated simultaneously
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6538—Devices for collating sheet copy material, e.g. sorters, control, copies in staples form
    • G03G15/6547—Shifting sets of sheets in the discharge tray
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/421—Forming a pile
    • B65H2301/4212—Forming a pile of articles substantially horizontal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/421—Forming a pile
    • B65H2301/4213—Forming a pile of a limited number of articles, e.g. buffering, forming bundles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/422—Handling piles, sets or stacks of articles
    • B65H2301/4222—Squaring-up piles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/42—Piling, depiling, handling piles
    • B65H2301/422—Handling piles, sets or stacks of articles
    • B65H2301/4226—Delivering, advancing piles
    • B65H2301/42261—Delivering, advancing piles by dropping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2403/00—Power transmission; Driving means
    • B65H2403/40—Toothed gearings
    • B65H2403/41—Rack-and-pinion, cogwheel in cog railway
    • B65H2403/411—Double rack cooperating with one pinion, e.g. for performing symmetrical displacement relative to pinion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2405/00—Parts for holding the handled material
    • B65H2405/10—Cassettes, holders, bins, decks, trays, supports or magazines for sheets stacked substantially horizontally
    • B65H2405/11—Parts and details thereof
    • B65H2405/111—Bottom
    • B65H2405/1115—Bottom with surface inclined, e.g. in width-wise direction
    • B65H2405/11151—Bottom with surface inclined, e.g. in width-wise direction with surface inclined upwardly in transport direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2801/00—Application field
    • B65H2801/24—Post -processing devices
    • B65H2801/27—Devices located downstream of office-type machines
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00886—Sorting or discharging
    • G03G2215/0089—Shifting jobs

Definitions

  • the present invention relates to a sheet processing method of performing a predetermined process on sheets, a sheet processing apparatus for implementing the sheet processing method, and an image forming apparatus having the sheet processing apparatus.
  • some image forming apparatuses such as printers, are provided with a sheet processing apparatus for aligning a plurality of sheets having images formed (printed) thereon and, then, performing a process on the sheets, such as stapling (driving needles into) the end parts of the sheets.
  • Such a sheet processing apparatus is, in many cases, provided as an option unit which is detachably attached to a printer or a copying machine, and is mounted in such a way as to be connected directly with a sheet discharge port of the body of the image forming apparatus. Then, sheets which have been subjected to printing at the image forming apparatus body are sequentially supplied from the sheet discharge port to the sheet processing apparatus, at which the sheets are aligned and are, then, subjected to a predetermined process.
  • the sheet processing apparatus is disposed at the side of the sheet discharge port of the image forming apparatus body, not only the area of installation of the whole image forming apparatus is caused to increase, but also the production cost of the image forming apparatus is caused to rise disadvantageously.
  • a sheet processing apparatus which comprises a first sheet stacking portion for temporarily stacking a sheet discharged thereon, alignment means for aligning the sheet discharged on the first sheet stacking portion, sheet processing means for performing a predetermined process on the sheet stacked on the first sheet stacking portion, and a second sheet stacking portion located substantially vertically below the first sheet stacking portion, wherein the alignment means acts to cause the aligned sheet to drop to the second sheet stacking portion.
  • FIG. 1 is a sectional view showing in outline the arrangement of an image forming apparatus having a sheet processing apparatus mounted thereon according to an embodiment of the invention.
  • FIGS. 2 ( a ) and 2 ( b ) are sectional views for explaining the operation of the sheet processing apparatus according to the embodiment.
  • FIGS. 3 ( a ) and 3 ( b ) are sectional views for explaining the operation of slide guides in the embodiment, showing the state in which the slide guides are located at their standby positions.
  • FIGS. 4 ( a ) and 4 ( b ) are sectional views for explaining the operation of the slide guides in the embodiment, showing the state in which sheets have been aligned by the slide guides.
  • FIGS. 5 ( a ) and 5 ( b ) are sectional views for explaining the operation of the slide guides in the embodiment, showing the state in which the slide guides are located at their home positions and the sheets are dropping.
  • FIGS. 6 ( a ) and 6 ( b ) are sectional views for explaining the arrangement and operation of a slide guide and a fixed guide in another embodiment of the invention, showing the state in which the slide guide is located at its standby position.
  • FIGS. 7 ( a ) and 7 ( b ) are sectional views for explaining the operation of the slide guide in the embodiment shown in FIGS. 6 ( a ) and 6 ( b ), showing the state in which sheets have been aligned by the slide guide and the fixed guide.
  • FIGS. 8 ( a ) and 8 ( b ) are sectional views for explaining the operation of the slide guide in the embodiment shown in FIGS. 6 ( a ) and 6 ( b ), showing the state in which the slide guide is located at its home positions and the sheets are dropping.
  • FIG. 9 is a sectional view showing in outline the arrangement of an image forming apparatus having a sheet processing apparatus mounted thereon according to a further embodiment of the invention.
  • FIG. 10 is an enlargement view showing a reference wall and parts therearound.
  • FIGS. 11 ( a ) and 11 ( b ) are sectional views for explaining the operation of a sheet processing apparatus in which side wall parts are provided at the reference wall, showing the state in which the slide guides are located at their standby positions.
  • FIGS. 12 ( a ) and 12 ( b ) are sectional views for explaining the operation of the sheet processing apparatus in which the side wall parts are provided at the reference wall, showing the state in which sheets have been aligned by the slide guides.
  • FIGS. 13 ( a ) and 13 ( b ) are sectional views for explaining the operation of the sheet processing apparatus in which the side wall parts are provided at the reference wall, showing the state in which the sheets abut on the side wall part and are then dropping.
  • FIG. 14 is a front view for explaining the connection between the sheet processing apparatus and the image forming apparatus according to the invention.
  • FIG. 15 is a front view for further explaining the connection between the sheet processing apparatus and the image forming apparatus according to the invention.
  • FIG. 16 is a view showing the sheet processing apparatus and the image forming apparatus as viewed from the side opposite to the side shown in FIG. 14 .
  • FIG. 1 is a sectional view showing in outline the whole arrangement of a sheet processing apparatus and an image processing apparatus (printer) according to the embodiment of the invention.
  • reference numeral 100 denotes a printer body serving as the image forming apparatus.
  • the printer body 100 When connected solely to a computer or when connected to a network, the printer body 100 is arranged to form an image (print) on a sheet by a predetermined image forming process on the basis of image information, a printing signal or the like received from the computer or the network.
  • the sheet processing apparatus which is denoted by reference numeral 300 , is arranged to scoop up, with a flapper 301 , a sheet discharged outside from the printer body 100 , onto the side of the sheet processing apparatus 300 .
  • the sheet is caused to pass through a conveying part provided inside the sheet processing apparatus 300 and is stacked on a first sheet stacking portion in a state in which a surface having an image formed thereon faces downward, i.e., in the so-called face-down state.
  • the sheets as stacked are aligned by an alignment means and are bundled for every predetermined job.
  • the sheets as bundled are subjected to a predetermined process by a sheet processing means.
  • the detailed description of the sheet processing apparatus 300 will be made later herein.
  • the sheet processing apparatus 300 and the printer body 100 are electrically connected with each other by a cable connector (not shown).
  • the sheet processing apparatus 300 is provided with a casing part 300 A, which contains the various members of the sheet processing apparatus 300 .
  • the casing part 300 A of the sheet processing apparatus 300 is detachably attached to a casing part 101 A of the printer body 100 , which will be described later.
  • FIG. 14 is a view obtained by simplifying the view of FIG. 1 showing the outline arrangement of the printer body 100 on which the sheet processing apparatus 300 is mounted.
  • FIG. 15 is a view showing a section E—E of a connection part between the sheet processing apparatus 300 and the printer body 100 shown in FIG. 14 .
  • the mounting of the sheet processing apparatus 300 on the printer body 100 is effected by snap-fitting a connection part 380 of the sheet processing apparatus 300 to a recessed part formed at a joint between an exterior cover 150 and an exterior cover 151 of the printer body 100 .
  • the arrangement of the sheet processing apparatus 300 and the image forming apparatus on the side opposite to the side shown in FIG. 14 is the same as that shown in FIG. 14 .
  • exterior covers of the printer body which are conventionally provided, can be utilized without making a special alteration to the printer body 100 , so that it is possible to reduce the cost of the printer body 100 and to prevent the fine appearance in design of the printer body 100 from being impaired.
  • Detachment of the sheet processing apparatus 300 from the printer body 100 can be effected by releasing the connection part 380 from snap-fitting.
  • support members 360 and 370 of the sheet processing apparatus 300 which abut on the printer body 100 , are arranged such that, in consideration of the position of a stapling part (stapler) H serving as a sheet processing means, the support member 360 , which is provided on the side for supporting the stapling part H being heavy, is disposed at a position nearer to the stapling part H than the support member 370 , which is provided on the side not for supporting the stapling part H.
  • the support member 360 and the support member 370 are arranged in the state of shifting from each other by a distance L.
  • This arrangement is provided for compensating for such a construction that the stapling part H in the present embodiment is disposed to staple the sheets on one end on the discharge direction side thereof and, therefore, the balance of weight between the right and left ends is not made. Accordingly, if the balance of weight is made symmetrical between the right and left ends by adjusting the position of the stapling part H or by additionally providing a weight member or the like, the disposition of the support members 360 and 370 should not be limited to the above-mentioned disposition.
  • the sheet processing apparatus 300 may be arranged to be surely supported by adjusting the strength or the like of the supporting members.
  • the support member 370 is kept in contact with the casing part 100 A of the printer body 100 at the position on a display panel 390 of the printer body 100 . This arrangement prevents the visibility of the display panel 390 from being hindered by the support member 370 .
  • a feed cassette 200 is capable of accommodating a plurality of sheets to be subjected to image formation, and is arranged to sequentially feed the accommodated sheets one by one with the various rollers.
  • a toner image is formed on a photosensitive member at an image forming part 101 disposed inside the printer body 100 , on the basis of a printing signal transmitted from a computer or a network.
  • the toner image formed on the photosensitive member is transferred onto the sheet S which has been fed from the feed cassette 200 . Then, the toner image is semipermanently fixed to the sheet S at a fixing part 120 .
  • the sheet S having an image thus fixed thereto is turned up at an approximately-U-shaped sheet conveying path leading to a discharge roller 130 , so that the top and bottom of the image-formed surface of the sheet S are reversed. Then, the sheet S is discharged outside from the printer body 100 by the discharge roller 130 in a state in which the image-formed surface faces downward.
  • the position of the flapper 301 in the sheet processing apparatus 300 is decided on the basis of a control signal supplied from a control part (not shown), so that, selectively, the sheet S is discharged to a face-down discharge part (a second sheet stacking portion) 125 provided on the upper surface part of the printer body 100 or the sheet S is conveyed to the side of the sheet processing apparatus 300 .
  • the flapper 301 is controlled in such a way as to be brought to the position for discharging the sheet S from the discharge roller 130 to the second sheet stacking portion 125 , so that a sheet having an image formed thereon can be discharged without hindrance.
  • the invention is not limited to such an image forming apparatus, but is also applicable to an image forming apparatus of the ink-jet type in which an image is formed on a sheet by jetting ink. Thus, any image forming processes are applicable.
  • an image forming apparatus for forming an image on one side of the sheet is shown in the present embodiment, the invention is applicable to an image forming apparatus of the type having a construction for forming images on two sides of the sheet.
  • FIGS. 2 ( a ) and 2 ( b ) show the sections of the discharge roller 130 and the sheet processing apparatus 300 .
  • FIG. 3 ( a ) shows the section A—A of the sheet processing apparatus 300 shown in FIG. 1 .
  • FIG. 3 ( b ) shows the section B—B of the sheet processing apparatus shown in FIG. 3 ( a ).
  • reference numeral 320 denotes a conveying roller
  • reference numeral 321 denotes a discharge sensor
  • reference character M denotes a jogger motor
  • reference numeral 322 denotes a sheet return member
  • reference numeral 323 denotes a reference wall for abutting thereon the rear end of the sheet.
  • the conveying roller 320 is disposed above the flapper 301 , which serves as a switching means as mentioned above, on the downstream side in the sheet conveying direction, and is arranged to be driven to rotate by a driving motor (not shown).
  • the discharge sensor 321 is disposed near the conveying roller 320 on the downstream side in the sheet conveying direction, and is arranged to detect the passage of the front end and rear end of the sheet as conveyed by the conveying roller 320 .
  • the jogger motor M is a motor capable of rotating forward and backward for driving slide guides 310 and 311 , which serve as guide members, and is a stepping motor in the case of the present embodiment.
  • the sheet return member 322 is disposed, as shown in FIGS. 2 ( a ) and 2 ( b ), on the most downstream side in the sheet conveying direction in the sheet processing apparatus 300 , and is arranged to be swingable around a pivot shaft part 322 a.
  • FIG. 2 ( a ) shows the initial position of the sheet return member 322 .
  • FIG. 2 ( b ) shows a state in which the sheet return member 322 is pushed up by the sheet S which has been conveyed up to the sheet return member 322 .
  • the sheet return member 322 has a predetermined value of weight.
  • the sheet return member 322 When having being pushed up counterclockwise, as viewed in FIG. 2 ( b ), by the sheet S, the sheet return member 322 is caused to swing in the direction of an arrow shown in FIG. 2 ( b ) (clockwise) by being urged by a spring (not shown).
  • a swinging force of the sheet return member 322 causes the rear end in the sheet conveying direction of the sheet S to abut on the reference wall 323 , so that the alignment action in the sheet conveying direction is performed on the sheet S.
  • the alignment action on the sheet S may be performed without utilizing the urging force of the spring.
  • the sheet processing apparatus 300 is provided with the slide guide (R) 310 and the slide guide (L) 311 , which will be described later, as guide members for aligning the sheet S in the width direction thereof.
  • the sheet processing apparatus 300 performs the stapling operation in the following manner.
  • the fore end side of the flapper 301 is made to be located at a lower position than that of a nip portion of the discharge roller 130 by a solenoid (not shown) through a link mechanism (not shown). Accordingly, as shown in FIG. 2 ( a ), the sheet S discharged outside from the discharge roller 130 is led upward along the flapper 301 , and is conveyed to the inside of the sheet processing apparatus 300 . Then, the sheet S is transported to the first sheet stacking portion 300 B, which is arranged to temporarily stack sheets.
  • the first sheet stacking portion 300 B is composed of the slide guide (R) 310 and the slide guide (L) 311 . There are provided no members for touching and supporting the sheet at a space between the slide guide (R) 310 and the slide guide (L) 311 . In other words, the sheet S discharged to the first sheet stacking portion 300 B is stacked with the right end part of the sheet S supported by the slide guide (R) 310 and the left end part of the sheet S supported by the slide guide (L) 311 .
  • the slide guide (R) 310 and the slide guide (L) 311 which are disposed respectively on the right-hand side and the left-hand side with respect to the sheet discharging direction (an arrow T shown in FIG. 3 ( a )), retreat to their respective positions each of which is located outside by a predetermined amount with respect to the end of the width of the sheet S, so as not to interfere with the sheet S being conveyed, thus, waiting for the sheet S to come in.
  • the sheet processing apparatus 300 when the sheet S for the first time is discharged from the discharge roller 130 of the printer body 100 , the sheet S is transported by the flapper 301 to the inside of the casing part 300 A, and is discharged onto the guide surface of the first sheet stacking portion 300 B, which is composed of the slide guide (R) 310 and the slide guide (L) 311 , by the discharge roller 320 , which is driven to rotate by a driving motor (not shown).
  • the guide surface of the first sheet stacking portion 300 B is, as shown in FIG. 2 ( a ), inclined by a predetermined angle with respect to the horizontal direction, and the angle of inclination differs with the upstream side and the downstream side of the guide surface of the first sheet stacking portion 300 B in the sheet discharging direction. More specifically, there is formed a bend part 300 C which is bent by an angle of inclination ⁇ between a predetermined section on the upstream side and a predetermined section on the downstream side.
  • the guide surface of the first sheet stacking portion 300 B is arranged to prevent a middle portion of the sheet S, which is not guided by the slide guides 310 and 311 , from bending, with the rigidity of the sheet S utilized.
  • the angle of inclination ⁇ depends on an angle of inclination of the slide guides 310 and 311 , an angle which the second sheet stacking portion 125 makes with a horizontal plane, etc., it is not always necessary that the angle of inclination ⁇ differs with the upstream side and the downstream side in the sheet discharging direction. Thus, the angle of inclination ⁇ may be made zero.
  • a fore end of the sheet S conveyed to the inside of the casing part 300 A of the sheet processing apparatus 300 causes a flag 321 a of the discharge sensor 321 to swing counterclockwise as viewed in FIG. 2 ( a ).
  • the sheet return member 322 which is caused to swing in the direction of the arrow shown in FIG. 2 ( b ) (clockwise) by being urged by the spring (not shown) causes the rear end of the sheet S to abut on the reference wall 323 . Accordingly, the alignment action in the sheet conveying direction (in the longitudinal direction) is performed on the sheet S stacked on the first sheet stacking portion 300 B.
  • the present embodiment is arranged such that, when the discharge sensor 321 turns off, only the slide guide (R) 310 on the right-hand side acts to start the alignment action in the width direction of the sheet S discharged on the first sheet stacking portion 300 B.
  • the slide guide (R) 310 is driven by the jogger motor M to move in the direction of an arrow L shown in FIG. 3 ( a ), so that reference pins (R) 330 which are projections provided on the slide guide (R) 310 abut on the right side surface of the sheet S. Then, the slide guide (R) 310 pushes the sheet S, with the reference pins (R) 330 , toward the slide guide (L) 311 .
  • the left side surface of the sheet S pushed by the slide guide (R) 310 comes to abut on reference pins (L) 331 which are projections provided on the slide guide (L) 311 . Accordingly, the sheet S is moved to a predetermined position.
  • FIGS. 3 ( a ) and 3 ( b ) show the section A—A of the sheet processing apparatus 300 shown in FIG. 1 .
  • FIGS. 4 ( a ) and 4 ( b ) and FIGS. 5 ( a ) and 5 ( b ) are sectional views for explaining the operation of the slide guides 310 and 311 .
  • FIG. 3 ( a ) shows the sheet processing apparatus 300 as viewed from the side of the jogger motor M shown in FIG. 3 ( b ), with a frame F shown in FIG. 3 ( b ) removed.
  • the slide guides 310 and 311 are arranged to move to the right and to the left in FIG. 3 ( a ) (in the width direction of the sheet), i.e., in directions perpendicular to the sheet conveying direction (the arrow T shown in FIG. 3 ( a )), by receiving a driving force transmitted from the jogger motor M, while being guided by guide pins 314 a, 314 b, 314 c and 314 d provided on the frame F of the sheet processing apparatus 300 .
  • the slide guide (L) 311 is restrained from moving further in the direction of the arrow R because of abutting on the guide pin 314 c.
  • the position of the guide pin 314 c is decided with respect to the position of the stapling part H. Since the stapling part H in the present embodiment is fixed to the sheet processing apparatus 300 , it is necessary to perform the alignment action on the sheet S with the stapling part H always used as a point of reference. The reason for this is that, if the slide guide (L) 311 is moved to the side in the direction of the arrow R beyond the stapling part H at the time of the alignment action, the stapling operation becomes impossible.
  • each of the slide guides 310 and 311 is composed of a wall part arranged to guide each side surface of the sheet S and a guide part arranged to support the upper and lower surfaces of the sheet S. Since the sheet S is supported by the lower surface of the guide part of each of the slide guides 310 and 311 , a middle portion of the sheet S in the width direction thereof is not supported.
  • the first sheet stacking portion 300 B is provided with a stepped gear 317 , which is arranged to receive a driving force from the jogger motor M. Then, the slide guide (R) 310 is provided with a rack part 310 a having an open toothed part, which meshes with the stepped gear 317 .
  • a slide rack 312 At a position opposite to the rack part 310 a across the stepped gear 317 , there is provided a slide rack 312 .
  • the slide rack 312 has also an open toothed part, which meshes with the stepped gear 317 .
  • the slide rack 312 is arranged to be relatively movable with respect to the slide guide (L) 311 via a coiled spring 313 .
  • the spring 313 has its one end engaging with the slide guide (L) 311 and its other end engaging with the slide rack 312 . Then, the spring 313 is arranged to have its spring force acting in such a way as to extend the space between the slide guide (R) 311 and the slide rack 312 .
  • the slide rack 312 has an embossed part 312 a, which moves inside a rectangular hole part 311 a formed on the slide guide (L) 311 as a slot extending in the width direction of the sheet, and is thus arranged to fit into the slide guide (L) 311 .
  • slide guide (R) 310 and the slide guide (L) 311 have their positions in the height direction regulated by the stepped gear 317 and a height regulating member 315 .
  • the side wall of the slide guide (R) 310 is provided with two reference pins (R) 330
  • the side wall of the slide guide (L) 311 is provided with two reference pins (L) 331 . Then, when the alignment action on the sheets in the width direction thereof is performed, the slide guide (R) 310 moves to cause the reference pins (R) 330 and the reference pins (L) 331 to abut on the right and left end surfaces of the sheet S, respectively. Accordingly, the sheets S stacked on the first sheet stacking portion 300 B are aligned in respect of the position in the width direction.
  • the reference pins (R) 330 and the reference pins (L) 331 are made of material having high abrasion resistance (rigidity). The reason for this is that, if a portion abutting on the sheet is abraded when the sheet processing apparatus 300 has performed the alignment action on the sheets a great number of times, it becomes impossible to perform a high-accurate alignment action.
  • the discharge roller 320 is driven by the driving motor to start rotating. Subsequently, when the jogger motor M is rotated to cause the stepped gear 317 to rotate, a driving force is transmitted to the rack part 310 a of the slide guide (R) 310 , so that the slide guide (R) 310 retreats outside (in the direction of the arrow R in FIG. 3 ( a )).
  • the slide rack 312 is moved in the direction of the arrow L.
  • the embossed part 312 a of the slide rack 312 abuts on the left-side end surface (as viewed in FIG. 3 ( a )) of the rectangular hole part 311 a of the slide guide (L) 311
  • the slide guide (L) 311 is pushed by the embossed part 312 a to retreat outside (in the direction of the arrow L in FIG. 3 ( a )).
  • the slide guide (R) 310 is provided with a flag part 310 f.
  • the flag part 310 f When the flag part 310 f is moved up to a predetermined retreat position, as shown in FIG. 5 ( a ), the flag part 310 f blocks light incident on a photosensor 316 , thereby turning off the photo-sensor 316 .
  • the jogger motor M comes to a stop. This position is referred to as the “home position” of the sheet processing apparatus 300 .
  • the jogger motor M rotates in the direction reverse to the direction employed for the initial operation, so that the slide guide (R) 310 and the slide guide (L) 311 move inward. Then, each of the slide guide (R) 310 and the slide guide (L) 311 comes to a stop at such a position as to be wider by a predetermined amount “d” than the width of the sheet S discharged to the first sheet stacking portion 300 B, as shown in FIGS. 3 ( a ) and 3 ( b ).
  • the slide guide (L) 311 abuts on the guide pin 314 c and is thus prevented from moving further in the direction of the arrow R.
  • the position shown in FIGS. 3 ( a ) and 3 ( b ) is referred to as the “standby position”.
  • the reference pins (L) 331 of the slide guide (L) 311 are used as the reference position for the alignment action.
  • the standby position of each of the slide guide (R) 310 and the slide guide (L) 311 is set in such a manner that, in a case where the size (width) of the sheet S is the largest of sizes of sheets which can pass through the sheet processing apparatus 300 , each of gaps appearing on the both sides of the sheet S has the predetermined amount “d”.
  • the slide guide (R) 311 moves in the direction of the arrow L by an amount corresponding to such a difference in width, so that a gap between the sheet and the slide guide (R) 310 in the standby position has always the predetermined amount “d”.
  • a gap between the sheet and the slide guide (L) 311 becomes wider by an amount corresponding to half of the difference in sheet width than the predetermined amount “d”.
  • the sheet S for the first time is discharged from the discharge roller 130 of the printer body 100 , the sheet S is transported to the inside of the sheet processing apparatus 300 with the transporting direction of the sheet S controlled by the flapper 301 . Then, the sheet S is discharged onto the slide guides 310 and 311 by the discharge roller 320 .
  • the sheet S is conveyed along the supporting surfaces of the slide guides 310 and 311 (the lower surface parts of guide parts), so that the left-side corner part of the fore end (the left and bottom end part shown in FIG. 3 ( a )) of the sheet S enters an opening part of the stapling part H.
  • the fore end of the sheet S abuts on the sheet return member 322 , and, then, the rear end part of the sheet S is aligned with respect to the reference wall 323 by the action of the sheet return member 322 .
  • the rear end of the sheet S comes off the discharge roller 320 to turn off the flag 321 a of the discharge sensor 321 , the rear end side of the sheet S is pushed downward by the flag 321 a, as mentioned in the foregoing, so that the sheet S is caused to surely drop to the supporting surfaces of the first sheet stacking portion 300 B, which is composed of the slide guides (R) 310 and (L) 311 .
  • the jogger motor M starts rotating, so that the slide guides (R) 310 and (L) 311 , which have been in the standby position, begin the alignment action in the following manner.
  • the jogger motor M rotates in such a direction as to cause the slide guide (R) 310 to move inward (in the direction of the arrow L). Accordingly, the slide guide (R) 310 moves in the direction of the arrow L to abut on the right-side end part of the sheet S.
  • the rotation of the jogger motor M is transmitted to the slide rack 312 , so that the slide rack 312 moves inward (in the direction of the arrow R).
  • the spring 313 is compressed by the slide rack 312 . Since the end part of the spring 313 as compressed, which part is opposite to the side thereof engaging with the slide rack 312 , is engaging with the slide guide (L) 311 , a force with which the spring 313 as compressed tries to expand acts on the slide guide (L) 311 . Therefore, the slide guide (L) 311 tires to move in the direction of the arrow R.
  • the slide guide (R) 310 In the alignment action, first, with the slide guide (R) 310 moving in the direction of the arrow L, the reference pins (R) 330 abut on the right-side end surface of the sheet S, and then push the sheet S toward the slide guide (L) 311 . Then, when the left-side end surface of the sheet S abuts on the reference pins (L) 331 , there is obtained the state shown in FIGS. 4 ( a ) and 4 ( b ). Incidentally, in consideration of any bending of the sheet S, etc., the slide guide (R) 310 may be moved up to a position where the interval between the reference pins (R) 330 and (L) 331 becomes narrower than the length of the sheet S in the width direction thereof.
  • the jogger motor M temporarily stops when there has been obtained the state shown in FIGS. 4 ( a ) and 4 ( b ) in which the both side end parts of the sheet S abut on the slide guides 310 and 311 . After that, the jogger motor M starts rotating reversely and then stops when the slide guides (R) 310 and (L) 311 have come again to the standby position shown in FIGS. 3 ( a ) and 3 ( b ).
  • the control action on the amount of movement of the slide guide (R) 310 in such a series of operations is managed on the basis of the number of driving pulses for the jogger motor M, being a stepping motor, with the home position, where the photo-sensor 316 is light-blocked, taken as a reference point.
  • the slide guide (R) 310 returns to the standby position, while the slide rack 312 also moves in such a direction as to expand the spring 313 , the slide guide (L) 311 itself does not move, being kept in the standby position. Accordingly, the left-side end part of the sheet S, as viewed in FIG. 4 ( a ), is kept in the state of abutting on the slide guide (L) 311 .
  • the slide guide (R) 310 moves and the reference pins (R) 330 abut on the right-side end surface of the sheet S 2 .
  • the slide guide (R) 310 moves further up to a position where the left-side end surface of the sheet S 2 abuts on the reference pins (L) 311 provided on the slide guide (L) 311 . Accordingly, the sheet S 2 is aligned similarly to the sheet S for the first time. After that, the slide guide (R) 310 moves up to the standby position and then stops.
  • the above operation is performed until the last sheet Sn (for the n-th time) in one job is aligned. Then, in the state in which the reference pins (R) 330 provided on the slide guide (R) 310 cause the left-side end surfaces of the sheets to abut on the reference pins (L) 331 of the slide guide (L) 311 , i.e., in the state in which the alignment action has been performed as shown in FIGS. 4 ( a ) and 4 ( b ), the sheets are stapled by the stapling part H, which is located on the left side of the fore end of the sheet bundle.
  • the stapling action of the stapling part H is performed in such a manner that, since the sheets are stacked serially from the first page with an image-formed surface of each sheet facing downward, needles are driven into the sheet bundle upward from below.
  • the slide guide (L) 311 is stopped in the standby position without moving, and only the slide guide (R) 310 moves to cause the left-side end part of each sheet to align to the reference position for stapling. Accordingly, the stapling part H, which is disposed on the side of the slide guide (L) 311 , is enabled to perform the sheet stapling action accurately and simply.
  • the stapling part H is enabled to perform a stapling process excellent in accuracy and precision.
  • the jogger motor M is driven to rotate, so that the slide guide (R) 310 and the slide guide (L) 311 move in the direction of the arrow R and in the direction of the arrow L, respectively, from the state shown in FIG. 4 ( a ).
  • the slide rack 312 since, at the time of start of rotation of the jogger motor M, the slide rack 312 first moves to the left as viewed in FIG. 4 ( a ), the slide guide (L) 311 itself does not immediately move.
  • the sheet bundle drops downward as shown in FIGS. 5 ( a ) and 5 ( b ). Accordingly, the sheet bundle drops to the face-down discharge part (the second sheet stacking portion) 125 , which is provided on the upper surface of the casing part 100 A of the printer body 100 , and is stacked there.
  • the face-down discharge part 125 of the printer body 100 is used also as a stacking part for the sheet bundle discharged from the sheet processing apparatus 300 , without providing any dedicated stacking part for the sheet bundle. Therefore, the size of the sheet processing apparatus 300 can be reduced.
  • the sheet processing apparatus 300 is mounted on the upper portion of the casing part 100 A of the printer body 100 , and the conveying path for a sheet discharged from the printer body 100 in the face-down manner is changed over by the flapper 301 .
  • This arrangement obviates the necessity of provision of an inverting mechanism for discharging and stacking image-formed sheets in the order of page numbers, which mechanism is required in conventional processing apparatuses. Therefore, the size of the sheet processing apparatus 300 can be reduced with space saving and at low cost.
  • the operation of the printer body 100 and the sheet processing apparatus 300 is controlled as follows. After a sheet bundle stapled by the stapling part H is discharged to the face-down discharge part 125 , at least the first sheet which is discharged next is made to drop to the face-down discharge part 125 through the sheet processing apparatus 300 without being discharged directly to the face-down discharge part 125 from the printer body 100 .
  • This operation makes it possible to cover the stapled portion of a sheet bundle as earlier discharged, with a sheet which is next dropping. Therefore, even if, after that, a sheet is discharged directly to the face-down discharge part 125 , the above-mentioned inconveniences can be solved.
  • the slide guide (L) 311 may be made to move during the alignment action on sheets.
  • this arrangement can be realized by making the slide guide (L) 311 have the same construction as the slide guide (R) 310 .
  • both the slide guides are made to move so as to cause the sheets subjected to the alignment action to drop
  • only one of the slide guides may be made to move so as to cause the sheets to drop. This arrangement will be described later as another embodiment of the invention.
  • a processing means is exemplified by the stapling part H for stapling sheets
  • the invention is applicable, with the similar construction and control operation, to a means for performing a process after aligning sheets, such as a punching means for punching sheets, a binding means for fixing sheets with paste or the like, etc.
  • a predetermined process is performed on sheets as aligned
  • the invention is not limited to this arrangement and may be arranged to cause sheets which are not subjected to a process after being aligned to drop to the second sheet stacking portion 125 .
  • a sheet stacking position obtained by discharging sheets directly to the second sheet stacking portion 125 from the discharge roller 130 and a sheet stacking position obtained by aligning sheets at the first sheet stacking portion 300 B and causing the sheets to drop are made to shift from each other in the sheet width direction or in the sheet discharging direction, it becomes possible to perform a sorting control operation.
  • a sheet processing apparatus is disposed above a sheet discharge part of an image forming apparatus, sheets discharged onto a sheet stacking portion of the sheet processing apparatus are aligned and subjected to a predetermined process, and, after that, the sheets are dropped and stacked on the sheet discharge part of the image forming apparatus by moving the sheet stacking portion.
  • FIG. 6 ( a ) shows the sheet processing apparatus 300 as viewed from above
  • FIG. 6 ( b ) shows the section C—C of the sheet processing apparatus 300 shown in FIG. 6 ( a ).
  • both the slide guides on the right and left sides are made to move when causing sheets which have been temporarily stacked on the first sheet stacking portion 300 B and have been aligned to drop
  • the present embodiment is arranged such that, for the purpose of furthering the simplification and cost reduction of the sheet processing apparatus 300 , one guide member (L) 411 (hereinafter referred to as the fixed guide (L) 411 ) is fixed and only the other guide member (R) 410 (hereinafter referred to as the slide guide (R) 411 ) is made to move.
  • the slide guide (R) 410 is provided with a rack part 410 a having an open toothed part which meshes with the stepped gear 317 .
  • the fixed guide (L) 411 is fixed to the frame F, and the position of the fixed guide (L) 411 is the standby position in the first-mentioned embodiment (i.e., the reference position for stapling). Accordingly, a gap between the left-side end of the sheet conveyed and discharged onto the first sheet stacking portion 400 B and the fixed guide (L) 411 becomes the predetermined amount “d”.
  • the slide guide (R) 410 is arranged to be movable to the right and to the left as viewed in FIG. 6 ( a ), i.e., to be capable of making a reciprocating motion in the sheet width direction which is perpendicular to the sheet conveying direction.
  • the slide guide (R) 410 is driven to move by the jogger motor M. Further, the slide guide (R) 410 has its position in the height direction regulated by the stepped gear 317 and a height regulating member 415 .
  • the discharge roller 320 is driven by a conveying motor (not shown) to start rotating. Subsequently, when the jogger motor M is rotated to cause the stepped gear 317 to rotate, a driving force is transmitted to the rack part 410 a of the slide guide (R) 410 , so that the slide guide (R) 410 retreats outside (in the direction of the arrow R in FIG. 6 ( a )).
  • the slide guide (R) 410 is provided with a flag part 410 f.
  • the flag part 410 f When the flag part 410 f is moved up to a predetermined retreat position, as shown in FIG. 8 ( a ), the flag part 410 f blocks light incident on a photosensor, thereby turning off the photo-sensor.
  • the jogger motor M comes to a stop. This position is referred to as the “home position” of the sheet processing apparatus 300 .
  • the jogger motor M rotates in the direction reverse to the direction employed for the initial operation, so that the slide guide (R) 410 moves inward (in the direction of the arrow L in FIG. 6 ( a )). Then, the slide guide (R) 410 comes to a stop at such a position as to be wider by the predetermined amount “d” than the width of the sheet S discharged to the first sheet stacking portion 400 B, as shown in FIGS. 6 ( a ) and 6 ( b ).
  • the sheet S for the first time is discharged from the discharge roller 130 of the printer body 100 , the sheet S is transported to the inside of the sheet processing apparatus 300 with the transporting direction of the sheet S controlled by the flapper 301 . Then, the sheet S is discharged by the discharge roller 320 onto the first sheet stacking portion 400 B, which is composed of the slide guide (R) 410 and the fixed guide (L) 411 .
  • the sheet S is conveyed along the supporting surfaces of the slide guides (R) 410 and the fixed guide (L) 411 (the lower surface parts of guide parts), so that the left-side corner part of the fore end (the left and bottom end part shown in FIG. 6 ( a )) of the sheet S enters an opening part of the stapling part H.
  • the fore end of the sheet S abuts on the sheet return member 322 , and, then, the rear end part of the sheet S is aligned with respect to the reference wall 323 by the action of the sheet return member 322 .
  • the rear end of the sheet S comes off the discharge roller 320 to turn off the flag 321 a of the discharge sensor 321 , the rear end side of the sheet S is pushed downward by the flag 321 a, as mentioned in the foregoing, so that the sheet S is caused to surely drop to the supporting surfaces of the first sheet stacking portion 400 B, which is composed of the slide guide (R) 410 and the fixed guide (L) 411 .
  • the jogger motor M starts rotating, so that the slide guide (R) 410 , which has been in the standby position, begins the alignment action in the following manner.
  • the jogger motor M rotates in such a direction as to cause the slide guide (R) 410 to move in the direction of the arrow L. Accordingly, the slide guide (R) 410 moves to cause reference pins (R) 430 thereof to abut on the right-side end part of the sheet S. Further, the slide guide (R) 410 moves in the direction of the arrow L so as to cause the left-side end surface of the sheet S to abut on reference pins (L) 431 of the fixed guide (L) 411 .
  • FIGS. 7 ( a ) and 7 ( b ) The state obtained after the alignment action has been performed is shown in FIGS. 7 ( a ) and 7 ( b ).
  • the slide guide (R) 410 may be moved up to a position where the interval between the reference pins (R) 430 and (L) 431 becomes narrower than the length of the sheet S in the width direction thereof.
  • the jogger motor M temporarily stops when there has been obtained the state shown in FIGS. 7 ( a ) and 7 ( b ). After that, the jogger motor M starts rotating reversely and then stops when the slide guide (R) 410 has come again to the standby position.
  • the control action on the amount of movement of the slide guide (R) 410 is managed on the basis of the number of driving pulses for the jogger motor M, similarly to the first-mentioned embodiment.
  • a sheet for the second time or for the subsequent time is subjected to the alignment action in the similar manner.
  • the above operation is performed until the last sheet Sn (for the n-th time) in one job is aligned.
  • the sheets are stapled by the stapling part H, which is located on the left side of the fore end of the sheet bundle.
  • the fixed guide (L) 411 is fixed to the reference position, and only the slide guide (R) 410 moves to cause the left-side end part of each sheet to align to the reference position for stapling. Accordingly, the stapling part H, which is fixedly disposed on the side of the fixed guide (L) 411 , is enabled to perform the sheet stapling action surely and precisely.
  • the stapling part H is enabled to perform a stapling process excellent in accuracy.
  • the jogger motor M is driven to rotate, so that the slide guide (R) 410 moves in the direction of the arrow R from the state shown in FIG. 7 ( a ). Then, when the end part of the supporting surface of the slide guide (R) 410 has moved in the direction of the arrow R beyond the position of the right-side end part of the sheet bundle as stapled, the sheet bundle drops downward as shown in FIGS. 8 ( a ) and 8 ( b ). Accordingly, the sheet bundle drops to the face-down discharge part (the second sheet stacking portion) 125 , which is provided on the upper surface of the casing part 100 A of the printer body 100 , and is stacked there.
  • the sheet processing apparatus is arranged such that, in addition to the advantageous effect of the first-mentioned embodiment, one of the guides is fixed. Therefore, it becomes possible to further the simplification and cost reduction of the sheet processing apparatus.
  • the guide to be fixed is a guide disposed on the side where the stapling part H is located, the invention is not limited to this arrangement.
  • a stacking tray 325 serving as a second sheet stacking portion for stacking thereon sheets discharged from the sheet processing apparatus 300 and sheet bundles subjected to the stapling process is disposed above the face-down discharge part 125 of the printer body 100 .
  • a sheet bundle subjected to the stapling process by the stapling part H is necessarily stacked on the stacking tray 325 . Therefore, it becomes unnecessary to perform such a complicated control operation as described in the first-mentioned embodiment, i.e., a control operation for causing at least the next sheet after the sheet bundle subjected to the stapling process by the stapling part H is discharged to drop from the sheet processing apparatus 300 , without discharging that sheet to the face-down discharge part 125 from the discharge roller 130 of the printer body 100 .
  • the sheet processing apparatus 300 since it becomes possible to stack sheets or sheet bundles on the stacking tray 325 in addition to the face-down discharge part 125 of the printer body 100 , the sheet processing apparatus 300 according to the present embodiment is very convenient for users to discharge a great number of sheets.
  • the stacking tray 325 is added to the sheet processing apparatus 300 and the printer body 100 shown in FIG. 1, the flapper 301 , etc., are configured and controlled in the same manner as in the first-mentioned embodiment.
  • the invention is advantageous even for the construction in which the second sheet stacking portion (the stacking tray) 325 is provided separately from the face-down discharge part 125 .
  • FIG. 11 ( a ) shows the sheet processing apparatus 300 as viewed from above
  • FIG. 11 ( b ) shows the section D—D of the sheet processing apparatus 300 shown in FIG. 11 ( a ).
  • a sheet bundle subjected to the stapling process by the stapling part H is made to drop by moving both the slide guides to their respective outsides of the sheet processing apparatus 300 .
  • the reference wall 323 is provided with a member for causing the sheet to drop correctly.
  • FIG. 10 is an enlarged sectional view showing parts around the reference wall 323 in the present embodiment.
  • the reference wall 323 is provided with side wall parts 323 a, which are projections indicated by hatching.
  • the side wall parts 323 a are disposed in a protruded manner at the respective positions of the surface of the reference wall 323 , which are separate from each other at an interval wider than the width of the sheet.
  • the slide guides 310 and 311 are spread to the right and to the left, respectively, so as to cause a sheet stacked on the first sheet stacking portion 300 B to drop, the sheet sticks to the slide guide 310 or 311 , thereby deteriorating the property of dropping of the sheet, deteriorating the stacked state of the sheet after dropping, or, in some cases, causing jamming of the sheet.
  • the reference wall 323 is provided with the side wall part 323 a.
  • the advantageous effect of the side wall part 323 a will be described below.
  • the rear end part of the sheet which is in the state of sticking to the slide guide 311 abuts on the side wall part 323 a, so that the sheet is prevented from following the movement of the slide guide 311 . Accordingly, it becomes possible to cause the sheet to drop to the face-down discharge part 125 at an appropriate location. Since there is the possibility that the sheet sticks to either one of the slide guides 310 and 311 , the side wall part 323 a is provided on each side of the reference wall 323 .
  • the invention enables the space saving and cost reduction to be realized with the more simplified construction than in the conventional sheet processing apparatus.
  • the sheet processing apparatus 300 may be mounted on any kind of apparatus, without limiting to the image forming apparatus, as long as it is arranged to perform a stapling process, a punching process, or the like, on the sheet.
  • a plurality of sheet processing apparatuses may be provided in piles.
  • a sheet processed by the upper sheet processing apparatus is made to drop to the upper surface of the lower sheet processing apparatus. Therefore, it is preferable to provide the upper surface of the sheet processing apparatus with a stacking part for stacking sheets thereon.
  • the printer body 100 in each of the embodiments is assumed to be an apparatus of the so-called center reference type in which a sheet of any size is conveyed with the center of a conveying path taken as a reference. Therefore, a sheet which has been conveyed to the sheet processing apparatus 300 from the printer body 100 is discharged to the position where the center of the interval between the right and left guides is taken as a reference.
  • the printer body 100 is arranged to perform the so-called one-side reference conveying operation in which the sheet is conveyed with one side of the conveying path taken as a reference, it is of course possible to provide the sheet processing apparatus.
  • the invention may be modified such that a sheet which has been conveyed to the sheet processing apparatus 300 is subjected to the alignment action and, after that, is made to drop to the face-down discharge part 125 on the upper surface of the printer body 100 without being subjected to any predetermined process.

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  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Pile Receivers (AREA)
  • Discharge By Other Means (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
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CN1330299A (zh) 2002-01-09
KR100401781B1 (ko) 2003-10-17
JP4763898B2 (ja) 2011-08-31
US20030178761A1 (en) 2003-09-25
DE60136312D1 (de) 2008-12-11
US7216863B2 (en) 2007-05-15
CN1222844C (zh) 2005-10-12
KR20020000482A (ko) 2002-01-05
EP1168091B1 (en) 2008-10-29
EP1168091A1 (en) 2002-01-02
JP2002080162A (ja) 2002-03-19
US20010052666A1 (en) 2001-12-20

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